Search Publications
The dust-star interplay in late-type galaxies at z < 0.5: Forecasts for the JWST
Baes, Maarten; Bendo, George J.; Fritz, Jacopo +4 more
Context. In recent years, significant growth in the amount of data available to astronomers has opened up the possibility for extensive multi-wavelength approaches. In the field of galaxy evolution, such approaches have uncovered fundamental correlations, linking the dust component of a galaxy to its star formation rate (SFR). Despite these achiev…
The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel. Accuracy of the catalogue and of the measurements
Verbunt, Frank; Schrimpf, Andreas
We analyse a manuscript star catalogue by Wilhem IV, Landgraf von Hessen-Kassel from 1586. From measurements of altitudes and of angles between stars, given in the catalogue, we find that the measurement accuracy averages 26″ for eight fundamental stars, compared to 49″ of the measurements by Brahe. The computation in converting altitudes to decli…
XMM-Newton spectrum of the radio-loud quasar 3C 215: Slim accretion disk or SMBH binary
Tombesi, F.; Mei, A.
Context. Radio-loud active galactic nuclei (RL AGN) exhibit very powerful jet emission in the radio band, while the radio-quiet (RQ) AGN do not. This RL-RQ dichotomy would imply a sharp difference existing among these two classes, however, modern theoretical models and observations suggest a common nuclear environment that is possibly characterize…
Predicting far-infrared maps of galaxies via machine learning techniques
Baes, Maarten; Dobbels, Wouter
Context. The ultraviolet (UV) to sub-millimetre spectral energy distribution of galaxies can be roughly divided into two sections: the stellar emission (attenuated by dust) at UV to near-infrared wavelengths and dust emission at longer wavelengths. In Dobbels et al. (2020, A&A, 634, A57), we show that these two sections are strongly related, a…
Refined fundamental parameters of Canopus from combined near-IR interferometry and spectral energy distribution
Millour, F.; Zorec, J.; Domiciano de Souza, A. +3 more
Context. Canopus, the brightest and closest yellow supergiant to our Solar System, offers a unique laboratory for understanding the physics of evolved massive stars.
Aims: We aim at quantitatively exploring a large space of fundamental parameters of Canopus based on the combined analysis of its spectral energy distribution (SED) and optical-I…
Orbital eccentricities as indicators of stellar populations. II. Vertical velocity distribution from the Gaia DR2 catalogue
Cubarsi, R.; Stojanović, M.; Ninković, S.
Context. In previous work, we showed how the planar and vertical eccentricities of disc stars, e and e′, could be used as indicators of the stars' kinematic populations. For a local stellar sample drawn from the Gaia DR2 catalogue, these populations were represented geometrically in the eccentricity diagram, e′2 vs. e2, appro…
Relation of internal attenuation, dust emission, and the size of spiral galaxies. Calibration at low-z and how to use it as a cosmological test at high-z
López-Corredoira, M.; Gutiérrez, C. M.
Aims: Dust in spiral galaxies produces emission in the far-infrared (FIR) and internal absorption in visible wavelengths. However, the relation of the two amounts is not trivial because optical absorption may saturate, but the FIR emission does not. Moreover, the volume concentration of dust plays a role in the relation of absorption and emis…
The peculiar nebula Simeis 57. II. Distance, nature and excitation
Gull, T. R.; Brown, A. G. A.; Bally, J. +5 more
Simeis 57 (HS 191) is an optically bright nebula in the Cygnus X region with a peculiar appearance that suggests an outflow from a rotating source. Newly obtained observations and archival data reveal Simeis 57 as a low-density (ne ~ 100 cm−3) nebula with an east-to-west excitation gradient. The extinction of the nebula is A<…
The Solar Orbiter Radio and Plasma Waves (RPW) instrument (Corrigendum)
Hellinger, P.; André, M.; Maksimovic, M. +103 more
Planck 2018 results. VI. Cosmological parameters
Kim, J.; Miville-Deschênes, M. -A.; Boulanger, F. +179 more
We present cosmological parameter results from the final full-mission Planck measurements of the cosmic microwave background (CMB) anisotropies, combining information from the temperature and polarization maps and the lensing reconstruction. Compared to the 2015 results, improved measurements of large-scale polarization allow the reionization opti…